The approach had several strengths; we were able to control factors that may be difficult to control in clinical practice.
The approach had several strengths; we were able to replicate conditions that may be difficult to control in clinical practice.
Since MTX was not randomly assigned, in this non-experimental setting causal inference relies on the assumption that no unmeasured confounders exist, which as noted already may be difficult to control for in practice [ 29].
Shotguns with heavy loads, such as 00 buck, can kick pretty hard, making them potentially difficult to control without practice.
It creates a rapid feedback cycle in the media that is much more difficult to control by practicing the "access" journalism that has been a mainstay of most recent administrations.
This difference is clearly observed when assessing each child individually, but the many confounding factors explaining at least part of this difference are difficult to control and avoid in clinical practice.
It is extraordinarily difficult to control it, in that sense".
It is difficult to control drug-prescribing behaviour in general practice, despite the development and distribution of guidelines.
It was more difficult to control the excavator in this experiment than in the CG experiment, and operators sufficiently practiced before the experiment.
"It is difficult to control the food in their mouths.
